Answer:
32
Explanation:
First you need to know that side length ST and TQ are equal because of the properties of parallelograms.
So, we set the two equations equal to each other.
5x + 1 = 2 ( x + 5 )
5x + 1 = 2x + 10 (distributive property)
3x = 9
x = 3
Now we know what x equals, we can substitute this value into one of the side lengths.
5(3) + 1 = ST
ST = 15 + 1
ST = 16
Now since SQ = ST + TQ, and ST = TQ, we can say that SQ = 16 x 2 = 32